Sellers are not obligated to let you off the hook when you have committed to buy an item. When you bid/buy an item, that is a message to the seller that you will pay for the item.
I strongly suggest that you pay for the item before it's too late especially if you have already received one strike. Two strikes and you will limited on the things you can purchase.
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Non payers should get unpaid item strikes and be added to block bidders lists. Period.